I picked up a Sansui AU-7700 today. This is a one family system since 1975 when it was purchased new. Very nice cosmetic condition and clean on the outside. It sat idle for about 10 years in a closet. On first listen the left channel fades out a minute or two after the speaker relay kicks in, but it does sound nice. Reviews I’ve read are encouraging and suggest a voicing similar to tube amps. Would folks in the group please share your experiences repairing, refurbishing or upgrading this integrated amp. I plan to do a thorough cleaning and inspection to start with. I don’t like to start massive component replacements like caps without assessing current problems. Thanks in advance for sharing.